/*
 * JaLingo, http://jalingo.sourceforge.net/
 *
 * Copyright (c) 2002-2006 Oleksandr Shyshko
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package uwncorrector.centre.gui.mediator;

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.JTextComponent;

public class EmptyFieldMediator {
    private JTextComponent textComponent;
    private JButton button;

    public EmptyFieldMediator( JTextComponent textComponent, JButton button ) {
        this.textComponent = textComponent;
        this.button = button;

        this.textComponent.getDocument().addDocumentListener( new DocumentListener() {
            public void insertUpdate( DocumentEvent e ) {
                updateEnablement();
            }
            public void removeUpdate( DocumentEvent e ) {
                updateEnablement();
            }
            public void changedUpdate( DocumentEvent e ) {
                updateEnablement();
            }
        } );
        updateEnablement();

        // TODO add hook for setDocument(): remove listener from old doc., add to new doc.
    }

    private void updateEnablement() {
        button.setEnabled( textComponent.getText().trim().length() > 0 );
    }
}
